/**
 * SkeletalBlender.ts
 *
 * Multi-clip animation blending: layer weights,
 * additive/override modes, crossfade, and pose mixing.
 *
 * @module animation
 */
export interface AnimPose {
    boneId: string;
    tx: number;
    ty: number;
    tz: number;
    sx: number;
    sy: number;
    sz: number;
}
export interface AnimLayer {
    id: string;
    poses: AnimPose[];
    weight: number;
    mode: 'override' | 'additive';
    mask?: Set<string>;
}
export declare class SkeletalBlender {
    private layers;
    private blendedPoses;
    addLayer(layer: AnimLayer): void;
    removeLayer(id: string): void;
    setLayerWeight(id: string, weight: number): void;
    getLayerWeight(id: string): number;
    blend(): Map<string, AnimPose>;
    crossfade(fromId: string, toId: string, t: number): void;
    private lerpPose;
    getLayerCount(): number;
    getBlendedPose(boneId: string): AnimPose | undefined;
}
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